What does it mean when a young bird is said to fledge?

When a young bird is said to fledge, it refers to the process of leaving the nest. This stage occurs after the bird has developed enough to survive outside the protective environment of the nest. While fledging may also involve the young bird learning to fly, the key concept associated with the term "fledge" specifically emphasizes the act of leaving the nest for the first time to start its independent life.

Moreover, fledging involves the physical development of feathers and the growth of muscles required for flight, as well as the beginning of foraging behaviors, but the definitive aspect of fledging is the departure from the nest. This transition is crucial for a bird's development, allowing it to explore its environment and start a life away from parental care.